Abstract
Its forward acceptance puts the LHCb experiment in a unique position at the LHC to measure soft QCD processes at large rapidities and low transverse momenta. Results on energy flow, charged particle multiplicities and inclusive cross-section ratios are discussed.
Highlights
§ part of underlying event § sensitive to multi-parton interactions & parton radiation § comparison to PYTHIA 6, PYTHIA 8 and cosmic ray models
PYTHIA 8.135 default: ¢ except for hard scattering the Energy Flow is well described for all samples
§ energy flow and multiplicities not well described by PYTHA 6 tunes
Summary
§ part of underlying event § sensitive to multi-parton interactions & parton radiation § comparison to PYTHIA 6, PYTHIA 8 and cosmic ray models (generators used to model cosmic ray induced air showers). ! P inclusive minimum bias: 1 tracks with 1:9; 4:9 and p > 2 GeV/c hard scattering: diffractive enriched:. Energy Flow increases with momentum transfer EFdiff < EFincl < EFndiff < EFhard highest sensitivity at large uncertainties: § dominated by systematics. PYTHIA 8.135 default: ¢ except for hard scattering the Energy Flow is well described for all samples. ¢ EPOS & SIBYLL: good description of EF for inclusive and non-diffractive events. ¢ QGSJET models: overestimated EF for inclusive and non-diffractive events; good description of hard scattering. SIBYLL 2.1 hard scattering events hard non-diffractive enriched events non-diffr
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